How to Convert BMP to HDR — Quick & Free
Fast, instant BMP to HDR conversion. No signup required. Just drop your .bmp file and get .hdr in seconds.
Batch Settings
写真やイラストを扱う際、BMP形式の画像は高い忠実度を保つ一方で、ファイルサイズが大きくなりがちです。特に、HDR（ハイダイナミックレンジ）形式への変換は、より豊かな色彩と奥行きを表現したい場合に有効な選択肢となります。当サイトの変換ツールは、お手元のBMP画像を、光の階調をより細やかに捉えるHDR形式へとスムーズに移行させます。細部の表現にこだわりたいクリエイターの方々はもちろん、ビジネス文書に鮮やかな画像を挿入したい方にも、この変換が新たな表現の可能性をもたらすことでしょう。複雑な設定は不要で、直感的な操作で高品質なHDR画像を手に入れていただけます。
- 漫画・アニメの背景美術
- ビジネス資料のグラフ表現
- 伝統工芸品のデジタルアーカイブ
日本のグラフィックデザインでは、BMPの忠実度を保ちつつ、HDRの豊かな表現力を加えることで、繊細な色彩や陰影のニュアンスを重視する傾向があります。特に、縦書き文書での画像配置において、色の見え方は重要な要素となります。
About BMP to HDR Conversion
Short answer: yes, you can convert BMP to HDR online for free, and quality is well preserved with the right settings. Just upload your .bmp file to CocoConvert, pick HDR as the output, and click Convert. The whole process takes seconds.
Now for the details. BMP is an uncompressed raster format that preserves every pixel but produces very large files. HDR (Radiance) is a high-dynamic-range image format used in lighting and rendering. Converting between these two formats lets you convert between formats quickly.
Full Name: BMP uses Bitmap Image, while HDR uses Radiance HDR Image. Compression: BMP uses None (uncompressed), while HDR uses Lossless. Transparency: BMP uses No, while HDR uses No.
Your BMP file is decoded and re-encoded as HDR. Converting BMP to HDR maintains high quality with CocoConvert's optimised encoder settings.
CocoConvert runs entirely online — no software to install, no account to create. Your files are encrypted during upload (TLS), processed on isolated servers in Germany, and permanently deleted after 24 hours. It works in Chrome, Safari, Firefox, Edge, and all mobile browsers.
Need to convert more than one file? Free users can do 5 per hour. Pro gets 100 per hour with files up to 5 GB each.
How to Convert BMP to HDR
- 1
1. Upload BMP
Drop your .bmp file onto the page (or tap "Browse" on mobile). Add multiple files for batch conversion.
- 2
2. Select HDR
Choose .hdr from the output dropdown. Settings are pre-configured for best results.
- 3
3. Convert
One click. The server handles all the heavy lifting using FFmpeg and Sharp.
- 4
4. Download
Your .hdr file is ready. Download it directly or get all files as a zip archive.
What Happens When You Convert BMP to HDR
Your BMP image is decoded into raw pixel data, then re-encoded as HDR. No quality loss — pixel data is preserved exactly.
Your BMP file is decoded — the compressed/stored pixel data is expanded into raw RGB pixels
Pixels are re-encoded using Radiance HDR Image's lossless compression
Metadata (EXIF, ICC profiles) is transferred where HDR supports it
The HDR file is saved and ready for download
BMP vs HDR — Detailed Comparison
| Feature | .BMP | .HDR |
|---|---|---|
| Full Name | Bitmap Image | Radiance HDR Image |
| Compression | None (uncompressed) | Lossless |
| Transparency | No | No |
| Animation | No | No |
| Color Depth | up to 32 bits/channel | 32-bit float (RGBE encoding) |
| HDR Support | No | Yes |
| Typical File Size | 10–50 MB per photo (uncompressed) | 5–50 MB |
| Platform Support | Universal | Very Limited |
| Browser Support | Limited | none |
| Year Created | 1986 | 1985 |
| Open Standard | No | Yes |
Should You Convert BMP to HDR?
When to Convert
- ✓When you specifically need a HDR file for your workflow
Frequently Asked Questions
Is BMP to HDR conversion free?
Yes. CocoConvert offers free BMP to HDR conversion with generous daily limits — 25 minutes of processing time and up to 5 files per hour (250 MB each). Pro plans remove these limits.
How fast is BMP to HDR conversion?
Most files convert in 2–10 seconds depending on size. Large image files may take 30 seconds. Batch jobs process in parallel for maximum speed.
What happens to my files after conversion?
Your uploaded BMP file and the converted HDR file are both automatically deleted from our servers within 24 hours. They are never shared, sold, or analysed.
Does converting BMP to HDR lose quality?
Converting BMP to HDR maintains high quality with CocoConvert's optimised encoder settings.
Can I convert HDR back to BMP?
Yes, CocoConvert supports HDR to BMP conversion as well. However, if the original conversion involved lossy compression, converting back won't recover the lost data.
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